The base is attached firmly but the post and mailbox are wobbly. What is the best way to make it stand straight? The metal rod inside isn’t very big. Could expandable foam or concrete be poured inside the post to make it stop flopping around?

Thank you for your interest in our products. Filling the post with sand will help the stability of the post. Filling the post with concrete will add the most rigid support but the concrete needs to be the proper consistency to prevent making a mess.